1、4.26-0.15-0.15-0.15-0.15
=4.26-0.15x4
=4.26-0.6
=3.66
2、6.75×2.4+7.6×6.75
=6.75x（2.4+7.6）
=6.75x10
=67.5
不理解可追问,有帮助请采纳,谢谢!